Author: upravnik

If a Cisco device is suffering from high CPU usage, we can use the show processes command to list all running processes and determine the cause of problem. This command gives you a list of active processes, along with their Read More …

The debug command displays information about the Cisco device operations, generated or received traffic, and any error messages. The information are provided in real-time until the user disables debugging or the device is restarted. The debug operation takes a lot Read More …

The traceroute command on a Cisco device can be used to identify the path used by a packet to reach its target. It identifies all the routers in the path from the source host to destination host and it can Read More …

The ping command in Cisco IOS (and other operating systems) is used to test the accessibility of devices on a TCP/IP network. Cisco devices also support the extended ping command that allows you to perform a more advanced check of Read More …

DNS is an  application layer protocol used to resolve hostnames to IP addresses. If you have a DNS server on your network, you can configure your Cisco device to use it for name resolution. Here are the steps: (Optional) If Read More …

It is possible to define static hostname-to-address mappings on a Cisco device for the purpose of name resolution. This is usually done in environments without a DNS server. The mappings can be defined using the global configuration command ip host Read More …

CDP (Cisco Discovery Protocol) is a proprietary protocol developed by Cisco used to discovers information about the locally attached Cisco equipment. With CDP, the administrator can gather hardware and protocol information about neighboring devices, which can be helpful when troubleshooting Read More …

NTP (Network Time Protocol) is an application layer protocol used for time synchronization between hosts on a TCP/IP network. The goal of NTP is to ensure that all devices on a network agree on the time, since even a small difference Read More …

Dynamic Host Configuration Protocol (DHCP) is an application layer protocol used to distribute various network configuration parameters to devices on a TCP/IP network. – IP addresses, subnet masks, default gateways, DNS servers, etc. DHCP employs a client-server architecture; a DHCP client Read More …

Cisco devices usually have four types of memory that are being used for different purposes. These four types are: ROM (Read-only memory) – stores a bootstrap program that is used to initialize a boot process. This is a read-only type Read More …